Thread protector nuts



March 16, 1943. w cox 2,314,079

THREAD PROTECTOR NUTS Filed May 2, 1941 Patented Mar. 16, 1943 THREADPROTECTOR NUTS Woodford Cox, Harrisburg, Ill. Application May 2, 1941,Serial No. 391,575

1 Claim.

This invention relates to a. clamping nut device particularly adaptablevfor use with a threaded terminal stud or' post of an electric apparatus,and it is the principal object of this invention to provide a pairofclamping nuts designed to clamp therebetween a cable terminal may bemade within the scope of what is claimed without departing from thespirit of the invention.

A practical embodiment of the invention is illustrated in theaccompanying drawing, where- Figure 1 is a sectional view showing a pairof thread protector nuts with a cable terminal clamped therebetween.

Figure 2 is a transverse horizontal sectional view on line 2-2, Fig. 1,showing the cable terminal seated on face of lower nut.

Figure 3 is a plan view' of the upper nut. Referring to the drawing indetail, l denotes a threaded stud or post such as may be used on abattery, switchboard or other electrical apparatus, and to which thecable terminal H is to be connected. The cable terminal is of a wellknown type comprising a tubular shank portion l2 in which the end of anelectric con-v ductor cable I3 is securely connected, and a flatextension or clamping end |4 provided with an elongated opening l5.While a cable terminal has been shown by way of example, it is to beunderstood that the clamping nuts to be hereinafter described maybe usedwith a conductor bar or any other type of perforate electricalconnecting member. In fact as will be obvious from the followingdescription the pair of clamping nuts may be used on any threaded memberwhere it is desired to protect the threads thereof from example, ofhexagonal form. Both the boss 2|. and head 22 are co-axially disposed oneach side of the circular flange, there extending through the same athreaded bore 23. Preferably the upperface 24 of the circular flange ismachined to provide a flat surface, and the boss 2| is also machined toan external diameter such as to permit the same to flt into the openingI! of the cable terminal II with the clamping end i4 thereof thus inseating engagement with the flat face 24.

The upper nut I9 is shaped to provide a circular flange 26 ofsubstantially the same dimensions as the flange 20 on the lower nut l8,and the underside face 21 of the flange'26 is likewise machined toprovide a flat clamping surface. Above the flange 26 the nut I9 isprovided with an hexagonal wrench engaging head 28, and extending intothe flange 26 co-axial with the head 28 is a circular recess 29 of adiameter slightly exceeding the external diameter of the circular boss2| on the lower nut i8, and of a depth such as to permit the receptiontherein of the upper portion of said circular boss 2|. Extending axiallythrough the nut I9 is a threaded bore 3|! of the same dimensions andnumber of threads as to size as that of the threaded bore 23.

Thus, it will be seen that by first placing the lower nut ill on thestud l0, then placing the flat extension l4 of the cable terminal II ontheface 24 of the nut |8 with the boss 2| projecting up through theopening IS in said flat extension, and then placing the upper nut I! onthe stud i0, that by setting up the nuts l8 and I! on the stud ill thecable terminal II will be clamped between the clamping faces 24 and 21.As the cylindrical boss 2| projects into the cylindrical recess 29 it isapparent that the boss 2| thus acts as a guard for the threads of thestud I0 so that the same can never be marred or otherwise injured by thecable terminal II.

This clamping nut construction will permit axial adjustment of the cableterminal ii on the stud Ill at any point thereon in the manner readilyapparent.

vIn some instances it may be desirable to attach small conductor wiresto the stud I0, as for example an ammeter wire conductor to an ammeter.Accordingly the flanges 20 and 28,

respectively of the nuts I8 and iii, are provided with inwardlyextending radial openings 22, there being four such provided on eachflange. Arranged normal to the axis of each opening 32 and projectingfrom the flange on the same contact faces, a cylindrical annular bossintegral with one nut and projecting axially beyond the flat contactface thereof, the other nut having an annular recess extended inwardlyof the flat contact face of the nut, said annular boss beingcomplemental to the recess and of less diameter than the recess so as toprovide a free fit whereby said contact faces may be brought intocontacting engagement with an interposed terminal con- 10 nector engagedupon said boss.

WOODFORD cox.

